Creation of spin-triplet Cooper pairs in the absence of magnetic ordering

Abstract

In superconducting spintronics, it is essential to generate spin-triplet Cooper pairs on demand. Up to now, proposals to do so concentrate on hybrid structures in which a superconductor (SC) is combined with a magnetically ordered material (or an external magnetic field). We, instead, identify a novel way to create and isolate spin-triplet Cooper pairs in the absence of any magnetic ordering. This achievement is only possible because we drive a system with strong spin-orbit interaction--the Dirac surface states of a strong topological insulator (TI)--out of equilibrium. In particular, we consider a bipolar TI-SC-TI junction, where the electrochemical potentials in the outer leads differ in their overall sign. As a result, we find that nonlocal singlet pairing across the junction is completely suppressed for any excitation energy. Hence, this junction acts as a perfect spin triplet filter across the SC generating equal-spin Cooper pairs via crossed Andreev reflection.

arXiv comment12 pages, 8 figures

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Cited by in corpus (33)

• Odd-frequency superconducting pairing in one-dimensional systems
• Theory of Majorana zero modes in unconventional superconductors
• Odd-frequency superconducting pairing in junctions with Rashba spin-orbit coupling
• Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K1-xV3Sb5
• Perfect crossed Andreev reflection in Dirac hybrid junctions in the quantum Hall regime
• Odd-frequency superconducting pairing in Kitaev-based junctions
• On-demand thermoelectric generation of equal-spin Cooper pairs
• Formation and detection of Majorana modes in quantum spin Hall trenches
• Crossed Andreev reflection in spin-polarized chiral edge states due to the Meissner effect
• Theory of proximity effect in two-dimensional unconventional superconductor with Rashba spin-orbit interaction
• Subgap states in two dimensional spectroscopy of unconventional superconductors using graphene
• Superconducting proximity effect in $d$-wave cuprate/ graphene heterostructures
• Exciting odd frequency equal-spin-triplet correlations at metal-superconductor interfaces
• Influence of a chiral chemical potential on Weyl hybrid junctions
• Crossed Andreev reflection in topological insulator nanowire T-junctions
• Dirac point formation revealed by Andreev tunneling in superlattice-graphene/superconductor junctions
• The invisible Majorana bound state at the helical edge
• Edge-induced pairing states in a Josephson junction through a spin-polarized quantum anomalous Hall insulator
• Spin-polarized multiple Andreev reflections in spin-split superconductors
• A generic model with unconventional Rashba bands and giant spin galvanic effect
• Directional electron-filtering at a superconductor-semiconductor interface
• Odd-frequency superconducting pairing due to multiple Majorana edge modes in driven topological superconductors
• Transport signatures of a Floquet topological transition at the helical edge
• Andreev spectroscopy of nonhelical spin textures in topological insulators
• Spin-resolved spectroscopy of helical Andreev bound states
• Quantum Transport Properties of an Exciton Insulator/Superconductor Hybrid Junction
• Odd-frequency pairs and anomalous proximity effect in nematic and chiral states of superconducting topological insulators
• Backscattering off a driven Rashba impurity at the helical edge
• Effects of the Vertices on the Topological Bound States in a Quasicrystalline Topological Insulator
• Anomalous flux periodicity in proximitised quantum spin Hall constrictions
• Detection of fractional solitons in quantum spin Hall systems
• Spin-Valley Locking and Pure Spin-Triplet Superconductivity in Noncollinear Antiferromagnets Proximitized to Conventional Superconductors
• Odd-frequency Pairing in Josephson Junctions Coupled by Magnetic Textures